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Diffstat (limited to 'arch/csky/include/asm/processor.h')
-rw-r--r-- | arch/csky/include/asm/processor.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/csky/include/asm/processor.h b/arch/csky/include/asm/processor.h new file mode 100644 index 0000000000..e487a46d1c --- /dev/null +++ b/arch/csky/include/asm/processor.h @@ -0,0 +1,87 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASM_CSKY_PROCESSOR_H +#define __ASM_CSKY_PROCESSOR_H + +#include <linux/bitops.h> +#include <linux/cache.h> +#include <asm/ptrace.h> +#include <asm/current.h> +#include <abi/reg_ops.h> +#include <abi/regdef.h> +#include <abi/switch_context.h> +#ifdef CONFIG_CPU_HAS_FPU +#include <abi/fpu.h> +#endif + +struct cpuinfo_csky { + unsigned long asid_cache; +} __aligned(SMP_CACHE_BYTES); + +extern struct cpuinfo_csky cpu_data[]; + +/* + * User space process size: 2GB. This is hardcoded into a few places, + * so don't change it unless you know what you are doing. TASK_SIZE + * for a 64 bit kernel expandable to 8192EB, of which the current CSKY + * implementations will "only" be able to use 1TB ... + */ +#define TASK_SIZE (PAGE_OFFSET - (PAGE_SIZE * 8)) + +#ifdef __KERNEL__ +#define STACK_TOP TASK_SIZE +#define STACK_TOP_MAX STACK_TOP +#endif + +/* This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) + +struct thread_struct { + unsigned long sp; /* kernel stack pointer */ + unsigned long trap_no; /* saved status register */ + + /* FPU regs */ + struct user_fp __aligned(16) user_fp; +}; + +#define INIT_THREAD { \ + .sp = sizeof(init_stack) + (unsigned long) &init_stack, \ +} + +/* + * Do necessary setup to start up a newly executed thread. + * + * pass the data segment into user programs if it exists, + * it can't hurt anything as far as I can tell + */ +#define start_thread(_regs, _pc, _usp) \ +do { \ + (_regs)->pc = (_pc); \ + (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \ + (_regs)->regs[2] = 0; \ + (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \ + (_regs)->sr &= ~PS_S; \ + (_regs)->usp = (_usp); \ +} while (0) + +/* Forward declaration, a strange C thing */ +struct task_struct; + +/* Prepare to copy thread state - unlazy all lazy status */ +#define prepare_to_copy(tsk) do { } while (0) + +unsigned long __get_wchan(struct task_struct *p); + +#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) +#define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp) + +#define task_pt_regs(p) \ + ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) + +#define cpu_relax() barrier() + +register unsigned long current_stack_pointer __asm__("sp"); + +#endif /* __ASM_CSKY_PROCESSOR_H */ |